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authorAndreas Deresch <aderesch@fs.tum.de>2006-02-26 04:18:34 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-26 09:53:30 -0800
commit6070f9ec6b03cc46cd0242523326f7a296f47c1c (patch)
treeba976c8458cfc2429d32883141170bbc4dfd5049
parent13a229abc25640813f1480c0478dfc6bdbc1c19e (diff)
downloadlinux-linaro-6070f9ec6b03cc46cd0242523326f7a296f47c1c.tar.gz
[PATCH] i386: Handle non existing APICs without panicing
[description from AK] This fixes booting in APIC mode on some ACER laptops. x86-64 did a similar change some time ago. See http://bugzilla.kernel.org/show_bug.cgi?id=4700 for details Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/i386/kernel/io_apic.c6
-rw-r--r--arch/i386/kernel/mpparse.c10
2 files changed, 12 insertions, 4 deletions
diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c
index f2dd218d88c..235822b3f41 100644
--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -2566,8 +2566,10 @@ int __init io_apic_get_unique_id (int ioapic, int apic_id)
spin_unlock_irqrestore(&ioapic_lock, flags);
/* Sanity check */
- if (reg_00.bits.ID != apic_id)
- panic("IOAPIC[%d]: Unable change apic_id!\n", ioapic);
+ if (reg_00.bits.ID != apic_id) {
+ printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic);
+ return -1;
+ }
}
apic_printk(APIC_VERBOSE, KERN_INFO
diff --git a/arch/i386/kernel/mpparse.c b/arch/i386/kernel/mpparse.c
index e7609abf379..e6e2f43db85 100644
--- a/arch/i386/kernel/mpparse.c
+++ b/arch/i386/kernel/mpparse.c
@@ -915,6 +915,7 @@ void __init mp_register_ioapic (
u32 gsi_base)
{
int idx = 0;
+ int tmpid;
if (nr_ioapics >= MAX_IO_APICS) {
printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
@@ -935,9 +936,14 @@ void __init mp_register_ioapic (
set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && (boot_cpu_data.x86 < 15))
- mp_ioapics[idx].mpc_apicid = io_apic_get_unique_id(idx, id);
+ tmpid = io_apic_get_unique_id(idx, id);
else
- mp_ioapics[idx].mpc_apicid = id;
+ tmpid = id;
+ if (tmpid == -1) {
+ nr_ioapics--;
+ return;
+ }
+ mp_ioapics[idx].mpc_apicid = tmpid;
mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
/*